[SRILM User List] Class-based probability using -expand-classes

Jonathan Mendoza mrfox321 at gmail.com
Wed May 16 13:35:58 PDT 2018

SRILM community,

If I build a class based LM via

replace-words-with-classes -> ngram

then re-build the LM using -expand-classes,

will the rebuilt LM follow the class based probabilities,

P(w_n | w_n-1 ... w_1) ?= P(w_n | c_n) * P(c_n | c_n-1 ... c_1).

Or is the mapping an approximate inverse to the original language model?
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